Study of Magnetic Properties and Lattice Dynamics of the Cdx Co1-x Ferrite System by MossbauerEffect

Abstract:

The magnetic properties and lattice dynamics of the spinel ferrite system Cdx Coi-x Fe^ 04 (x = 0.0, 0.1, . . . , and 1.) were studied in the temperature range between 78 to 800°K. The results showed that the samples with x = 0.0 up to 0.5 are ferrimagnetic at room temperature, and a magnetic disorder transformation started to appear at x = 0.6. The Neel temperature was found to decrease with increasing cadmium concentration. The reduced hyperfine magnetic fields for the A- and the B- sites were found to follow the Brillouin function and One-Third-Power Law. The results showed also that the introduction of the Cd2"^ ions decreased the f-value and Debye temperature, while the mean square velocity of the "Fe nucleus was not affected greatly specially at low and normal temperatures. The anisotropic energy, for O.KX <0.9 was found to be of the order of IXlO'^erg.